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Although you usually use an MP4 player to play back audio and video files, you can also use one to transfer books from one computer to another and even read them on the device. Some MP4 players have a built-in ebook reader, while others can only store the files. Always make sure you have enough free space to store all files before you attempt to download them.

1. Connect your MP4 player to your computer using the USB cable that came with the device. Windows 7 detects the MP4 player as an external device and assigns a drive to it.

2. Click the "Start" button in the bottom-left corner of your screen and click "Computer" to launch the Windows 7 native file manager.

3. Locate and select your books. You can press "Ctrl-A" to select all books in a folder or hold "Ctrl" and click on each one until you select the books that you want to send to the device.

4. Press "Ctrl-C" to copy the books to the clipboard.

5. Open the drive assigned by Windows 7 to your MP4 player.

6. Press "Ctrl-V" to paste the books from the clipboard. Do not disconnect the USB cable until the transfer is complete.